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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50607244dc0ad3e833a4c8501df9ab0a0d6a4e78a2a3f265df3fad60140a3e3a' 
  AND token = 'DdosP/1J49T2U4ZglFYio+nrxdjuAXfdRjN8YqkD29A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}